The episode centers on Sheldon being terrorized by Bobbi Sparks, the six-year-old daughter of the neighbors, Herschel and Brenda Sparks.

Watch Sheldon's hilarious attempt to use physics for self-defense and the Cooper family's struggle with his unlikely bully:

The title references Sheldon’s post-school ritual of drinking a Yoo-hoo to decompress from the stress of dodging his bully. Sheldon’s Failed Solutions

In a bid for safety, Sheldon wraps himself in bubble wrap to cushion potential blows, which is quickly discovered by his parents during breakfast.

Mary tries to protect him by confronting the Sparks, while George Sr. believes Sheldon needs to learn to handle it without "tattling".

George Sr. (played by Lance Barber ) admits he was once a bully, a meta-nod to Barber's previous guest role as Leonard's high school bully on The Big Bang Theory .

Despite his intellect, Sheldon is physically intimidated by the much younger girl, who "slaps him around" and takes his lunch money.